UltraScan PRO Supplemental Manual for EasyMatch QC Ver. 2.0
21
Figure 23. Prompt for Fluorescent Standard
Place the fluorescent standard at the instrument port, centering spot 3 at the reflectance port. Use the
dotted guides on the labeled side of the standard to properly center the standard under the sample
clamp. Select
READ
to read the fluorescent standard with the UV filter in the position indicated at the
bottom of the screen. If desired, the slider bar may be used to change the filter position between
manual readings.
Click
STANDARDIZE
to initiate standardization. You will be returned to the UV Calibration screen after
standardization is complete.
Note: Before calibrating the UV filter, standardize the instrument in the mode
referenced on the label of the fluorescent standard. If the label does not specify a
standardization mode, standardize in RSEX.
Measure both spot 3 and spot 4 of the fluorescent standard every six months. Compare the results. If
spot 3 has faded beyond tolerable limits for your application, use spot 4 for UV filter calibration from
this point on and order a new fluorescent standard (HL#A02-1011-126 [calibrated]).
Note: If you choose to employ the calibrated filter position, this position should be
employed for all routine measurements using this instrument. If you calibrated the UV
filter with an open port and then you wish to use a cover glass, you must recalibrate
the UV filter with the cover glass in place.
Haze Measurements
A transmission haze measurement is a ratio of the diffuse light to the total light transmitted by a
specimen. Useful measurements of haze can be made on the HunterLab instruments listed below,
although the results do not conform exactly to ASTM method D1003 because of differences in
instrument geometry. Haze is calculated as follows:
100
x
Y
Y
Haze
on
Transmissi
Total
on
Transmissi
Diffuse
=
.
Haze measurements can be made only in a transmission mode on a benchtop sphere instrument
(UltraScan PRO, UltraScan VIS, or Vista).
To measure and display haze values, follow the steps outlined below:
1.
Select
OPTIONS > READ METHOD
.
2.
Select
HAZE
from the dialog box that appears. The screen changes to allow additional
options.
